$3a^2b^3\:por\:-4x^2y$

$0.3\left(5-2.2v\right)$

$\left(-2y+3x^2y\right)dx+\left(-2x+x^3+y\right)dy=0$

$\left(x+2\right)\left(x+0.75\right)\left(x-0.9\right)$

$\frac{49x^2-16}{7x-4}$

$\lim_{x\to0}\left(\frac{x^2y+y^3}{x^3}\right)$

$\frac{tan\left(\theta\:\right)+cot\left(\theta\:\right)}{cot\left(\theta\:\right)-tan\left(\theta\:\right)}=sec2\left(\theta\:\right)$